Michael McMannis was a Staff Sergeant assigned to the reality show, "Boot Camp Babes" as a liaison.
He developed a romantic relationship with the deceased model, Taylor Shane and the two were planning to get married after the show had ended but Shane died under mysterious circumstances.
While being interrogated by Ziva David, McMannis later began suffering from an overdose of PCP which had cost Shane her life.
As such, McMannis had a psychotic break and began raging against Ziva, believing that NCIS were trying to destroy him. This in turn prompted him to act rather harshly against Ziva, forcing Anthony DiNozzo to step into the interrogation room to stop things from getting out of hand.
But McMannis overpowered DiNozzo and was about to go for Ziva when the two managed to get the better of him before forcing him to the floor.
As a result, McMannis suffered a breakdown, crying almost immediately and seconds after entering interrogation, Leroy Jethro Gibbs realized that he was overdosing on PCP while also handcuffing McMannis for his own safety.
Thanks to the NCIS Agents, McMannis was taken to hospital for treatment. His final fate is unknown but it's presumed that he made a full recovery.